Thanks for the quick response. I'll try the bootdelegation way. I could also of course explain the code more and even post some code as it is but I honestly do not know what parts that you might find interesting as I have little knowledge about the workings of class loaders. :(
Regards, Per-Erik Svensson On Thu, Jul 1, 2010 at 3:21 PM, Richard S. Hall <[email protected]>wrote: > Well, the simplest thing to do here is to add that package to the > org.osgi.framework.bootdelegation framework configuration property. You will > likely also need to set org.osgi.framework.bundle.parent=app to use the > application class loader for boot delegation. > > Without more detailed knowledge of your application and the code involved, > it is difficult to say if there is a better way to go about this. I do know > that the look and feel stuff is known to be problematic. > > -> richard > > > On 7/1/10 8:06, Per-Erik Svensson wrote: > >> Hello, >> >> I'm working in a project where we use felix/osgi to create a >> "plugin-framework" for a client side application. It works very well but >> we >> sometimes run into class loading problems, especially when one of our >> "plugin"-bundles use third part libraries that loads classes through >> Class.forName(). >> >> Short description of the system: >> Our system consists of our main application (not loaded through osgi) that >> "embeds" Felix and starts the system bundle. We then use FileInstall to >> add >> plugins (ie other bundles). >> >> Problem: >> SwingX is one of the libraries that use Class.forName() and >> Class.getClassLoader().loadClass(). It does this to support different lafs >> (such as Substance) and the calls are in a class named LookAndFeelAddons. >> Here, it asks the UIManager to get the UI-class for a certain >> SwingX-component and then load the UI-class using either forName() or >> getClassLoader().loadClass(). So, if a class in a plugin is using a SwingX >> component, that bundle/plugin must have access to the UI-class. This >> causes >> problems. We have one plugin with a JPanel-class that uses the JXHeader >> from >> the SwingX library. When the component is created we get the following >> ClassNotFoundException: >> >> java.lang.RuntimeException: java.lang.RuntimeException: Failed to load >> class >> org.jvnet.substance.swingx.SubstanceHeaderUI >> at >> >> consilium.publish.wizard.ProfilesPanel$EditProfileWorker.done(ProfilesPanel.java:473) >> at javax.swing.SwingWorker$5.run(SwingWorker.java:718) >> at >> >> javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:864) >> at >> sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:95) >> at >> >> javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:874) >> at javax.swing.Timer.fireActionPerformed(Timer.java:271) >> at javax.swing.Timer$DoPostEvent.run(Timer.java:201) >> at >> java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) >> at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) >> at >> consilium.tools.InputZookeeper.dispatchEvent(InputZookeeper.java:709) >> at >> >> java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) >> at >> >> java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) >> at >> >> java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178) >> at java.awt.Dialog$1.run(Dialog.java:1051) >> at java.awt.Dialog$3.run(Dialog.java:1103) >> at java.security.AccessController.doPrivileged(Native Method) >> at java.awt.Dialog.show(Dialog.java:1101) >> at java.awt.Component.show(Component.java:1516) >> at java.awt.Component.setVisible(Component.java:1468) >> at java.awt.Window.setVisible(Window.java:841) >> at java.awt.Dialog.setVisible(Dialog.java:991) >> at consilium.gui.SizedDialog.setVisible(SizedDialog.java:136) >> at consilium.actions.MenuBuilder$16$1$1.run(MenuBuilder.java:490) >> at >> java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) >> at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) >> at >> consilium.tools.InputZookeeper.dispatchEvent(InputZookeeper.java:709) >> at >> >> java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) >> at >> >> java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) >> at >> >> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) >> at >> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) >> at >> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) >> at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) >> Caused by: java.lang.RuntimeException: Failed to load class >> org.jvnet.substance.swingx.SubstanceHeaderUI >> at >> >> org.jdesktop.swingx.plaf.LookAndFeelAddons.getUI(LookAndFeelAddons.java:319) >> at org.jdesktop.swingx.JXHeader.updateUI(JXHeader.java:181) >> at javax.swing.JPanel.<init>(JPanel.java:69) >> at javax.swing.JPanel.<init>(JPanel.java:92) >> at javax.swing.JPanel.<init>(JPanel.java:100) >> at org.jdesktop.swingx.JXPanel.<init>(JXPanel.java:110) >> at org.jdesktop.swingx.JXHeader.<init>(JXHeader.java:113) >> at >> >> se.conciliate.htmlprofileeditor.editor.HTMLProfileEditor.initComponents(HTMLProfileEditor.java:353) >> at >> >> se.conciliate.htmlprofileeditor.editor.HTMLProfileEditor.init(HTMLProfileEditor.java:98) >> at >> >> se.conciliate.htmlprofileeditor.editor.HTMLProfileEditor.<init>(HTMLProfileEditor.java:86) >> at >> >> se.conciliate.htmlprofileeditor.HTMLPublishProfileService.editProfile(HTMLPublishProfileService.java:124) >> at >> >> consilium.publish.wizard.ProfilesPanel$EditProfileWorker.done(ProfilesPanel.java:465) >> ... 31 more >> Caused by: java.lang.ClassNotFoundException: >> org.jvnet.substance.swingx.SubstanceHeaderUI >> at >> >> org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.findClass(R4SearchPolicyCore.java:198) >> at >> >> org.apache.felix.framework.searchpolicy.R4SearchPolicy.findClass(R4SearchPolicy.java:45) >> at >> >> org.apache.felix.framework.searchpolicy.ContentClassLoader.loadClass(ContentClassLoader.java:118) >> at java.lang.ClassLoader.loadClass(ClassLoader.java:252) >> at >> >> org.jdesktop.swingx.plaf.LookAndFeelAddons.getUI(LookAndFeelAddons.java:316) >> ... 42 more >> Caused by: java.lang.ClassNotFoundException: >> org.jvnet.substance.swingx.SubstanceHeaderUI >> at >> >> org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.findClassOrResource(R4SearchPolicyCore.java:486) >> at >> >> org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.findClass(R4SearchPolicyCore.java:185) >> ... 46 more >> >> As you can see, LookAndFeelAddons wraps the exception in a >> RuntimeException. >> But it is clear from the Caused by that it is indeed a >> ClassNotFoundException and that the class that cannot be found is >> org.jvnet.substance.swingx.SubstanceHeaderUI. This class is part of the >> main >> application and thus not loaded (exported) to the OSGi-framework. The >> offending class is the UI-class for the SwingX component JXHeader under >> the >> Substance look and feel. Now, I'm no master at class loading and certainly >> not at OSGi class loading. But as I understand it, the bundle/plugin gets >> its own class loader. Is there any way to set things up so that the >> bundle/plugin class loader can delegate the class loading to the main >> applications class loader. I mean, since the main application has >> org.jvnet.substance.swingx.SubstanceHeaderUI on its classpath it will be >> able to load it (and is able to load it in all code that we use from the >> main application). >> >> Hope I have explained the problem decently enough. I first thought about >> exporting the package org.jvnet.substance.swingx from the system bundle >> and >> importing it from the plugin-bundle. But this is not desirable since the >> plugin shouldn't be tied to our specific LAF (it shouldn't even have to >> know >> that we use Substance and it shouldn't have to know the internal workings >> of >> swingx-laf addons). >> >> Regards, >> Per-Erik Svensson >> >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
